<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			#one {
				width: 400px;
				height: 400px;
				background-color: red;
			}
			#two {
				width: 300px;
				height: 300px;
				background-color: green;
			}
			#three {
				width: 200px;
				height: 200px;
				background-color: blue;
			}
			#two, #three {
				position: relative;
				left: 50px;
				top: 50px;
			}
		</style>
	</head>
	<body>
		<div id="one">
			<div id="two">
				<div id="three"></div>
			</div>
		</div>
		<script>
			(function() {
				function f1(evt) {
					alert('I am one');
				}
				
				function f2() {
					alert('I am two');
				}
				
				function f3(evt) {
					alert('I am three');
					evt = evt || window.event;
					// 阻止事件传播行为(冒泡或捕获)
					if (evt.stopPropagation) {
						evt.stopPropagation();
					} else {
						evt.cancelBubble = true;
					}
				}
				// 要么是全局作用域 要么是函数级作用域
				// 事件捕获 - 从外层向内层传递事件的过程
				// 事件冒泡 - 从内层向外层传递事件的过程(默认)
				// 内嵌的元素在响应事件之后会继续将事件传递到它的父元素
				var fs = [f1, f2, f3];
				var ids = ['one', 'two', 'three'];
				for (var i = 0; i < ids.length; i += 1) {
					var div = document.getElementById(ids[i]);
					if (div.addEventListener) {
						// 如果需要使用事件捕获可以传入第三个参数并赋值为true
						div.addEventListener('click', fs[i]);
					} else {
						div.attachEvent('onclick', fs[i]);
					}
				}
			})();
		</script>
	</body>
</html>
